The Evolution of Powell Basin (Antarctica)
Powell Basin is an ocean basin formed as a result of the Scotia Sea evolution. The existing tectonic models propose a variety of starting and ending ages for the spreading of the basin based on seafloor magnetic anomalies. Here, we use recent magnetic field data obtained from eight magnetic profiles...
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MDPI AG
2024-10-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/16/21/4053 |
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| author | Alberto Santamaría Barragán Manuel Catalán Yasmina M. Martos |
| author_facet | Alberto Santamaría Barragán Manuel Catalán Yasmina M. Martos |
| author_sort | Alberto Santamaría Barragán |
| collection | DOAJ |
| description | Powell Basin is an ocean basin formed as a result of the Scotia Sea evolution. The existing tectonic models propose a variety of starting and ending ages for the spreading of the basin based on seafloor magnetic anomalies. Here, we use recent magnetic field data obtained from eight magnetic profiles in Powell Basin to provide insights into the oceanic spreading evolution. The differences found between the number of anomalies on both sides of the axis and the asymmetry in the spreading rates suggest different opening models for different parts of the basin. We propose a spreading model starting in the late Eocene (38.08 Ma) and ending in the early Miocene (21.8 Ma) for the northern part of Powell Basin. For the southern part, the opening started in the late Eocene (38.08 Ma) and ended in the middle Paleogene (25.2 Ma). The magnetic data have been combined with gravity and sediment thickness data to better constrain the age models. The gravity and sediment thickness information allow us to more accurately locate the position of the extinct spreading axis. Geothermal heat flow measurements are used to understand the relationship between the low amplitudes of the magnetic anomalies and the heat beneath them. Our proposed oceanic spreading models suggest that the initial incursions of the Pacific mantle outflow into the Powell Basin occurred in the Oligocene, and the initial incursions of oceanic currents from the Weddell Sea occurred in the Eocene. |
| format | Article |
| id | doaj-art-d9729f5068484fbd8f3350812d8de02f |
| institution | Kabale University |
| issn | 2072-4292 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj-art-d9729f5068484fbd8f3350812d8de02f2024-11-08T14:40:39ZengMDPI AGRemote Sensing2072-42922024-10-011621405310.3390/rs16214053The Evolution of Powell Basin (Antarctica)Alberto Santamaría Barragán0Manuel Catalán1Yasmina M. Martos2Chemistry Science Building, University of Salamanca, 37008 Salamanca, SpainFormerly at the Department of Geophysics, Royal Observatory of the Spanish Navy, 11100 San Fernando, SpainPlanetary Magnetospheres Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAPowell Basin is an ocean basin formed as a result of the Scotia Sea evolution. The existing tectonic models propose a variety of starting and ending ages for the spreading of the basin based on seafloor magnetic anomalies. Here, we use recent magnetic field data obtained from eight magnetic profiles in Powell Basin to provide insights into the oceanic spreading evolution. The differences found between the number of anomalies on both sides of the axis and the asymmetry in the spreading rates suggest different opening models for different parts of the basin. We propose a spreading model starting in the late Eocene (38.08 Ma) and ending in the early Miocene (21.8 Ma) for the northern part of Powell Basin. For the southern part, the opening started in the late Eocene (38.08 Ma) and ended in the middle Paleogene (25.2 Ma). The magnetic data have been combined with gravity and sediment thickness data to better constrain the age models. The gravity and sediment thickness information allow us to more accurately locate the position of the extinct spreading axis. Geothermal heat flow measurements are used to understand the relationship between the low amplitudes of the magnetic anomalies and the heat beneath them. Our proposed oceanic spreading models suggest that the initial incursions of the Pacific mantle outflow into the Powell Basin occurred in the Oligocene, and the initial incursions of oceanic currents from the Weddell Sea occurred in the Eocene.https://www.mdpi.com/2072-4292/16/21/4053magnetic anomaliesoceanic spreadingasthenospheric currentsoceanic currents |
| spellingShingle | Alberto Santamaría Barragán Manuel Catalán Yasmina M. Martos The Evolution of Powell Basin (Antarctica) Remote Sensing magnetic anomalies oceanic spreading asthenospheric currents oceanic currents |
| title | The Evolution of Powell Basin (Antarctica) |
| title_full | The Evolution of Powell Basin (Antarctica) |
| title_fullStr | The Evolution of Powell Basin (Antarctica) |
| title_full_unstemmed | The Evolution of Powell Basin (Antarctica) |
| title_short | The Evolution of Powell Basin (Antarctica) |
| title_sort | evolution of powell basin antarctica |
| topic | magnetic anomalies oceanic spreading asthenospheric currents oceanic currents |
| url | https://www.mdpi.com/2072-4292/16/21/4053 |
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